在进化中，信任很好的服务于人类因为它增加了脆弱群体生存的机会。
In evolution, trust served humans well because it increased the chances that vulnerable infants would survive.
玻璃，以一种或是另一种形式，长久以来高尚的服务于人类。
Glass, in one form or another, has long been in noble service to humans.
当然，动物服务于人类的一个最明显的方式，便是给人类作伴。
Of course, one of the most obvious ways animals serve man is as companions.
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